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      06-28-2011, 06:30 PM   #35
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Drives: 2013 E93 M3, Jerez Black
Join Date: Jun 2007
Location: Bay Area, CA

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Originally Posted by Sal@Evolve View Post
I think everyone is thinking these cars put down the same numbers on every single day no matter what fuel you throw at them and what ever the inlet temperatures.

Doesn't work like that.

Dyno numbers will change from day to day.

No stock car was tested on the day so do not try and compare to a stock car.

The fact is that primary decats add power. This is a fact.

The tune we do is specific for decatted cars.
Hey Sal,
That wasn't my point, I was actually curious as to whether or not the stock rear section becomes a bottleneck as power goes up.

I don't doubt that primary decats add power. What I am curious is that for cars with the turner test pipes, that retain the stock secondary cats but remove the primary cats, do you think any adjustment would be necessary, vs a fully catless tune? (I'm asking selfishly because I run the Turner test pipes with stock secondary cats too)

I've found that nothing behind the primary cats makes a lot of power, if the primary cats are in place. What I'm curious is that if the primary cats are removed, do the secondary cats and/or the stock rear section become a bottleneck?


DSC_3369 by Kit W, on Flickr